PhosphorSSTV Downloads & RevenuePhosphorSSTV · App Store
Not in any tracked top chart right now.
Updated 7 Nov 2026 · rankings refresh through the day
DeveloperStuart Woolley
CategoryUtilities
Price8.00 CNY
Released
Rating★ 0.0 (0)
Version1.2
Age rating4+
First seen by us
1 Nov 2026
1 Nov 2026Full timeline · 4 events
- 🆕PhosphorSSTV first spotted by AppInsider#35 in Top Paid · Utilities · China
- 🆕PhosphorSSTV: its developer released another app: PhosphorDSC
- 📦PhosphorSSTV version 1.2Fixed error in waterfall display if running for a prolonged period of time
Hardened FFT computations to minimise rounding errors
Robot 36 colour fix - If you tuned in partway through a Robot 36 picture, or a line dropped out, the decoder could swap the two colour channels for the rest of the image. It now reads which channel each line carries from the separator tone, rather than guessing from the line count.… more - 🆕PhosphorSSTV released on the App Store
Collected from the stores by AppInsider since we first spotted the app. Dates are when we saw each change.
Rating
0.0 ★
0 ratings
Measured
PhosphorSSTV on the App Store
App details
App ID
6761005542
Publisher
Stuart Woolley
On the store since
Mar 2026
Under a year
Minimum OS
iOS 18.0+
iPhone XS and later
Devices
iPhone · iPad
Content rating
4+
Languages
1
EN
Size
3 MB
Also listed in
Education
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Not charting right now. | ||
Ratings
App Store, worldwide.
Rating
0.0 ★
0 ratings
Measured
Ratings
0
Measured
About PhosphorSSTV
PhosphorSSTV decodes Slow Scan Television (SSTV) signals in real time using your iPhone's microphone.
SSTV has been the amateur radio image transmission mode since the 1960s. From cold-war era picture transmissions to International Space Station passes, SSTV encodes images as audio tones between 1200–2300Hz. Each scanline is a sweep through frequency space, painting pictures one line at a time across the HF bands.
Hold your phone near a shortwave radio tuned to an SSTV signal — or play a recording — and watch the image build scanline by scanline on an authentic phosphor CRT display, just like the original SSTV monitors.
No internet connection required. No external hardware. No account. Just your iPhone and a radio.
TEN SSTV MODES
• Scottie S1, S2, DX — the most widely used SSTV modes on HF worldwide
• Martin M1, M2 — popular across European SSTV activity
• Robot 36, 72 — YCbCr colour modes, used by the ISS during special events
• Robot 8, 12, 24 BW — fast greyscale modes for text, diagrams, and low-bandwidth conditions
REAL-TIME DECODING
• Progressive scanline rendering — the image builds top to bottom, just like a real SSTV monitor
• VIS code detection automatically identifies the transmission mode
• Sync-aligned slant correction eliminates timing drift for straight, clean images
• Hilbert transform FM discriminator for accurate frequency-to-pixel conversion
SIGNAL ANALYSIS
• Live FFT spectrum display shows the full 0–4 kHz audio band
• Scrolling waterfall reveals the SSTV signal structure in real time
• SSTV band markers at 1200 Hz (sync), 1500 Hz (black), and 2300 Hz (white)
• Input gain control from 0.1× to 20×
IMAGE LOG
• Decoded images saved automatically with thumbnails
• Full metadata: mode, timestamp, duration, VIS detection status
• View full-size, share, or delete
• Swipe to delete, tap to view detail
AUTHENTIC CRT AESTHETIC
• Green and amber phosphor display themes
• Scanline overlay, vignette, and glow effects
• Monospaced terminal typography throughout
• The same retro aesthetic as our PhosphorRTTY and PhosphorCW apps
WHERE TO FIND SSTV
• 20m band: 14.230 MHz USB — primary worldwide SSTV frequency
• 80m band: 3.845 MHz LSB
• 40m band: 7.171 MHz LSB
• ISS: 145.800 MHz FM during special SSTV events
• Or search YouTube/archive.org for SSTV audio recordings to decode
PRIVACY
PhosphorSSTV makes zero network requests. No accounts, no tracking, no analytics, no ads. Microphone audio is processed entirely on-device and is never recorded or transmitted. See our full privacy policy on our support page.
ABOUT SSTV
Slow Scan Television was developed in the late 1950s as a way to transmit still images over voice-bandwidth radio channels. Unlike fast-scan television (broadcast TV), SSTV takes seconds to minutes per image, encoding pixel brightness as audio frequency. The 1200 Hz sync pulse marks each line boundary, black is 1500 Hz, and white is 2300 Hz. Every pixel in between is a precise frequency in that range. Amateur radio
SSTV has been the amateur radio image transmission mode since the 1960s. From cold-war era picture transmissions to International Space Station passes, SSTV encodes images as audio tones between 1200–2300Hz. Each scanline is a sweep through frequency space, painting pictures one line at a time across the HF bands.
Hold your phone near a shortwave radio tuned to an SSTV signal — or play a recording — and watch the image build scanline by scanline on an authentic phosphor CRT display, just like the original SSTV monitors.
No internet connection required. No external hardware. No account. Just your iPhone and a radio.
TEN SSTV MODES
• Scottie S1, S2, DX — the most widely used SSTV modes on HF worldwide
• Martin M1, M2 — popular across European SSTV activity
• Robot 36, 72 — YCbCr colour modes, used by the ISS during special events
• Robot 8, 12, 24 BW — fast greyscale modes for text, diagrams, and low-bandwidth conditions
REAL-TIME DECODING
• Progressive scanline rendering — the image builds top to bottom, just like a real SSTV monitor
• VIS code detection automatically identifies the transmission mode
• Sync-aligned slant correction eliminates timing drift for straight, clean images
• Hilbert transform FM discriminator for accurate frequency-to-pixel conversion
SIGNAL ANALYSIS
• Live FFT spectrum display shows the full 0–4 kHz audio band
• Scrolling waterfall reveals the SSTV signal structure in real time
• SSTV band markers at 1200 Hz (sync), 1500 Hz (black), and 2300 Hz (white)
• Input gain control from 0.1× to 20×
IMAGE LOG
• Decoded images saved automatically with thumbnails
• Full metadata: mode, timestamp, duration, VIS detection status
• View full-size, share, or delete
• Swipe to delete, tap to view detail
AUTHENTIC CRT AESTHETIC
• Green and amber phosphor display themes
• Scanline overlay, vignette, and glow effects
• Monospaced terminal typography throughout
• The same retro aesthetic as our PhosphorRTTY and PhosphorCW apps
WHERE TO FIND SSTV
• 20m band: 14.230 MHz USB — primary worldwide SSTV frequency
• 80m band: 3.845 MHz LSB
• 40m band: 7.171 MHz LSB
• ISS: 145.800 MHz FM during special SSTV events
• Or search YouTube/archive.org for SSTV audio recordings to decode
PRIVACY
PhosphorSSTV makes zero network requests. No accounts, no tracking, no analytics, no ads. Microphone audio is processed entirely on-device and is never recorded or transmitted. See our full privacy policy on our support page.
ABOUT SSTV
Slow Scan Television was developed in the late 1950s as a way to transmit still images over voice-bandwidth radio channels. Unlike fast-scan television (broadcast TV), SSTV takes seconds to minutes per image, encoding pixel brightness as audio frequency. The 1200 Hz sync pulse marks each line boundary, black is 1500 Hz, and white is 2300 Hz. Every pixel in between is a precise frequency in that range. Amateur radio
Latest updates
1.2
Fixed error in waterfall display if running for a prolonged period of time
Hardened FFT computations to minimise rounding errors
Robot 36 colour fix - If you tuned in partway through a Robot 36 picture, or a line dropped out, the decoder could swap the two colour channels for the rest of the image. It now reads which channel each line carries from the separator tone, rather than guessing from the line count.
